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(No Model.)

C. RUSSELLv a1,- P. E. GRAGIN.

Y PAPER PULP SCREEN. No. 359,543.

PatentedMaJr. l5, 188.7.

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/ ATTORNEYS VNrrnn STATES I Aifniwr- Fries.

CALVIN RUSSELL AND PATRICK H. CRAGIN, OF PENN YAN, NEV YORK, VASSIGNORS TO THE SENECA SCREEN COMPANY, OE SAME PLACE.

PAPER-PU LP SCREEN.

SPECIFICATION forming part lof Letters Patent No. 359,543, dated March 15, 1887.

Application filed August 14, 1886. Serial No. QlO,SG7. (No model T all whom t may concern,.- with one or more longitudinal ribs, r r, they Be it known that we, CALVIN RUSSELL and are rendered more effective in their operation. PATRICK H. CRAGIN, of Penn Yan, in the B B represent the stationary bars or particounty of Yates, in the State of New York, tions between the pumping-barsAA. These have invented new and useful Improvements partitions we now provide with longitudinal 55 in Paper-Pulp Screens, of which thefollowing, indentations or channels c in their tops, and taken in connection with the accompanying secure to the under side of the screen C strips drawings, is afull, clear, and exact description. d, of wood or metal or other suitable material,

This invention relates to the paper-pulp coinciding with the channels of the partitions 1o screen for which we have led an application and iitted closely thereto, so as to form a tight 6o for United States Letters Patent on the 26th joint and support the central portion of the day of March, 1886, Serial No. 196,624.. screen, and at the same time form a separate Our present invention consists in an irnand distinct compartment for each pumping proved construction and combination of parts bar, thereby further increasing the efticiency whereby the apparatus is rendered more efiiof the pumping apparatus under the screen. 65 cient in its operation and other important In order to dispense with the stuffing-boxes advantages are attained for the same, as herein the sides of the'vat for the reception of the inafter more fully explained, and specifically journals of the pumping-bars, we now provide set forth in the claims. one side of the vat with openings o o, respect- 2O In the annexed drawings, Figure 1 is a side lively, at the ends of the pumping-bars, and 7o elevation of our improved paper-pulp screen, detachably secure to the vat covering-plates with a portion of the side broken away to uit, which close said openings, and are proillustrate the internal arrangement thereof. vided on their inner sides with suitable bear- Fig. 2 is a longitudinal vertical section of .the ings for the trunnions or ends of the shafts of same, and Fig. 3 is a partial view of the opthe pumping-bars, as shown in Fig. 2 of the 75 posite side of the pulp-vat. drawings. The opposite side of the vat we Similar letters of reference indicate correprovide with ports p, and secure to the exte spending parts. Y rior of the vat below said ports an apron, L, V represents thel vat in which the impuriwhich rises to an elevation above the waterties are eliminated from the paperpulp, said line of the vat. 80

vat being provided at its discharge end with The shafts a of the pumping-bars we extend a dam, D, which retains a body of liquid in through the ports and terminate them in crankthe vat, reaching nearly to the screen C,in the arms b b, which extend over the top of the usual manner. The said screen has heretofore apron and down on the exterior thereof, and

3 5 been firmly attached to the interior of the vat, are pivoted thereon at points respectively in P 5 and it was therefore exceedingly difficult to lines with the shafts a. obtain access to the pumping apparatus un- A reciprocating rod, R, connected to the derneath the screen when necessary for cleanrespective crank-arms, imparts the requisite ing or repairs. To obviate this defect we now oscillatory motion to the pumpingbars.

4o make the screen removable from the vat by Having described our invention, what we 90 hinging to the top of the vat a frame, F, which claim as new, and desire to secure by Letters is closely tted to the interior of the vat, and Patent, is adapted to be swung on its hinges and raised 1. In combination with the paper pulp out of the vat, as represented by dotted lines screen, a series of pulp-compartments sepain Fig. 1 of the drawings, and to said frame rated from each other by intervening parti- 95 we attach the screen C. tions extending to the under side of the screen,

AA denote the rocking or oscillatory pumpand a series of pumping bars or plungers aring-bars arranged in the diluted pulp underranged, respectively', in the said compartneath the screen. In practice we find that by ments, substantially as set forth.

5o providing the top of the said pumping-bars 2. The combination, with the vat, screen, 100

and plungers in the vat, of partitions arranged between said plungers and provided with indentations on their tops and strips secured to the under side of the screen and adapted to rest in the said indentations and support the central portion of the screen in the vat, substantially as set forth and shown.

3. In combination with the vat and screen, the oscillatory pumping-bars A A, provided with the longitudinal rib or ribs r, substantially as described and shown.

4. In combination with the screen G and pumping-bars A A, the vat V, provided with ports p, the apron L, secured to the exterior of the vat below the ports thereof and extending above the water-line of the vat, and the crankarms b b, extending through the ports and np over the top of the apron and pivoted to the exterior thereof, substantially as described and shown.

5. The combination, with the vat V, of the pulp-screen hinged on said vat, as set forth.

G. rllhe combination, with the vat V, of a frame removably connected to said vat and the screen secured to said frame, substantially as described and Shown.

7. The combination, with thc vat V, of a frame removably connected to said vat, the screen secured to said frame, and partitions in the vat supporting the central portion of the screen, substantially as shown and set forth.

S. The pumping-bars provided with a trunnion on one end, in combination with the vat provided with openings at said ends of the bars, and covering-plates detaehably secured in said openings and provided with bearings for the trunnions of the pumping-bars, substantially as described and shown.

In testimony whereof we have hereunto signed our names and affixed our seals, in the presence of two attesting Witnesses, at Syraeuse, in the county of Onondaga, in the State of New York, this 12th day of August, 1886.

CALVIN RUSSELL. [Ls] PATRICK H. CRAGIN. [Ls] Witnesses:

FREDERICK H. GIBBs, C. BENDIXON. 

